cashin



2 Sheets-Sheet 1.

(No Model.) I

M. OA'SHIN.

BOILER TUBE EXPANDER.

No. 319,559. Patented June 9, 1885.

2 Sheets-Sheet 2.

(No Model.)

M. OASHIN.

BOILER TUBE EXPANDER.

No. 319,559. Patented June 9, 1885.

N. PETERS. Phoio-Lflhogmphnr. Waxhingtun. D C.

To all whom it may concern:

UNI-TED STATES PATENT Orricn.

MICHAEL GASHIN, OF SAN FRANCISCO, CALIFORNIA.

BOILER-TUBE EXPANDER.

EEPECIFICATION forming part of Letters Patent. No. 319,559, dated June9, 1885.

Application filed August 26, 1884. (No model.)

Be it known that 1, MICHAEL GASHIN, of the city and county of SanFrancisco, and State of California, have invented an Improvement inBoiler-Tube Expanders; and I hereby declare the following to be a full,clear, and exact description thereof.

My invention relates to the class of boilertube expanders; and itconsists in a novel manner of constructing the head of the implement tofit the sectors of the expandingblock thereto, and in the particularmechanism for imparting a rotary movement to said implement.

The object of my invention is to provide a simple and effectiveimplement for fitting the boiler-tubes to the seats in the heads of theboiler.

Referring to the accompanying drawings, Figure l is a perspective viewof my implement, a portion of the rim of head 0 being broken away. Fig.2 is alongitudinal section of same. Fig. 3 is an end elevation of same,showing lever mechanism.

A is a cylindrical block divided into any suitable number of sectors,(here shown in three,) and having mounted in its surface the rollers B,forming an annular series, each roller lying parallel with the axis ofrevolution of the cylindrical block.

C is the head, made up of an annular band inside and a plate outside,separated to form a slot, as shown, and suitably joined together bymeans of a peripheral band. This head is provided with radial guides c.The end of the block A is provided with flanges a and grooves a. Theflanges fit within the slot of the head, whereby the block is preventedfrom coming out, and the grooves are fitted upon the radial guides,whereby the sectors of the block are adapted to be guided in expanding.

D is a wedge having radial wings d. This wedge fits into acorrespondingly wedgeshaped socket made in the inner end of the block,the wings of the wedge fitting suitable grooves in the socket.

A screw, E, passes through the hub of the head, and through the centerof the block into the wedge. By the operation of this screw the wedge isdrawn into its seat for the purpose of expanding the block.

sides spring-pawls I, adapted to engage each with one of the rachets.These pawls are operated by oscillating the thumb-shaft J, provided withwings j, in such a manner that when the thumb-shaft is turned in onedirection one of the pawls is raised away from its ratchet and held indisengagement, while the other pawl is allowed to spring to itsengagement with the other ratchet, whereby the lever is adapted to turnthe whole device in one direction.

By the movement of the thumb-shaft in the other direction the first pawlsprings to its engagement with its ratchet, while the pawl previously inengagement is thrown out, thus adapting the lever to turn the device inthe other direction.

K isa nut screwed upon the end of the hub of the head, for holding theouter ratchet in place. The usual practice in fitting the tubes to theirseats in the heads of the boiler is to drive wedges into their ends, andthen insert a tapering rod by the hammering of which the tubes areextended to snugly fit their seats; but this operation is imperfect inits results and takes considerable time. 1

In operating my implement the block is in serted in the end of the tube.The screw is then operated to draw its wedge into its socket, thusexpanding the block to the required extent, in order to cause therollers to bear against the walls of the tube. The lever is then operated to turn the whole device, whereby the tubes are expanded equallyand effectively. To remove the implement, the screw is oper ated toforce the wedge back, thus allowing the spring to contract the block,whereupon it may be readily removed.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-- 1. In an implement, tool, or machine forexpanding the ends of boiler-tubes, the head 0, consisting of an outerdisk and an inner ring, separated to form a peripheral slot, and heldtogether by an encircling-band, said head 5 having radial guides c, incombination with the cylinder-block A,.comp0sed of sectors .havingflanges a on their rear ends fitting within the slot of the head, andgrooves a, fitted upon the radial guides c, the central 10 wedge, D, bywhich the block is expanded,

and the screw E, by which the wedge is operated, all arranged andadapted to operate substantially as herein described. I I

2. In an implement, tool, or machine for I 5 expanding the ends ofboiler-tubes, the head- O, having the peripheral slot and radial guidesc, the segmental block A, having flanges a fitting in the slot of thehead and grooves a fitted on the guides c, the rollers B on the block,the encircling-springli, the wedge D, 20

lever, adapted to engage with the ratchets;

and the winged thumb-shaft J, passing through the lever, to throw thepawls alternately out of or into engagement with the ratchets andreverse the direction of revolution of the im plement, substantially asherein described.

In witness whereof I have hereunto set my hand.

MICHAEL GASHIN.

Witnesses:

PAUL CASHIN, JOHN C. MCCLELLAND.

